/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
more details.

You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
**********/
// "liveMedia"
// Copyright (c) 1996-2018 Live Networks, Inc.  All rights reserved.
// RTP source for 'ADUized' MP3 frames ("mpa-robust")
// Implementation

#include "include/MP3ADURTPSource.hh"
#include "MP3ADUdescriptor.hh"

////////// ADUBufferedPacket and ADUBufferedPacketFactory //////////

class ADUBufferedPacket : public BufferedPacket {
private: // redefined virtual functions
    virtual unsigned nextEnclosedFrameSize(unsigned char *&framePtr,
                                           unsigned dataSize);
};

class ADUBufferedPacketFactory : public BufferedPacketFactory {
private: // redefined virtual functions
    virtual BufferedPacket *createNewPacket(MultiFramedRTPSource *ourSource);
};

///////// MP3ADURTPSource implementation ////////

MP3ADURTPSource *
MP3ADURTPSource::createNew(UsageEnvironment &env, Groupsock *RTPgs,
                           unsigned char rtpPayloadFormat,
                           unsigned rtpTimestampFrequency) {
    return new MP3ADURTPSource(env, RTPgs, rtpPayloadFormat,
                               rtpTimestampFrequency);
}

MP3ADURTPSource::MP3ADURTPSource(UsageEnvironment &env, Groupsock *RTPgs,
                                 unsigned char rtpPayloadFormat,
                                 unsigned rtpTimestampFrequency)
        : MultiFramedRTPSource(env, RTPgs,
                               rtpPayloadFormat, rtpTimestampFrequency,
                               new ADUBufferedPacketFactory) {
}

MP3ADURTPSource::~MP3ADURTPSource() {
}

char const *MP3ADURTPSource::MIMEtype() const {
    return "audio/MPA-ROBUST";
}

////////// ADUBufferedPacket and ADUBufferredPacketFactory implementation

unsigned ADUBufferedPacket
::nextEnclosedFrameSize(unsigned char *&framePtr, unsigned dataSize) {
    // Return the size of the next MP3 'ADU', on the assumption that
    // the input data is ADU-encoded MP3 frames.
    unsigned char *frameDataPtr = framePtr;
    unsigned remainingFrameSize
            = ADUdescriptor::getRemainingFrameSize(frameDataPtr);
    unsigned descriptorSize = (unsigned) (frameDataPtr - framePtr);
    unsigned fullADUSize = descriptorSize + remainingFrameSize;

    return (fullADUSize <= dataSize) ? fullADUSize : dataSize;
}

BufferedPacket *ADUBufferedPacketFactory
::createNewPacket(MultiFramedRTPSource * /*ourSource*/) {
    return new ADUBufferedPacket;
}
